Speaker
Description
A prototype of SRF Gun has been built and successfully tested at MSU for LCLS-II HE project. This gun uses an HZDR-type cathode and required the development and implementation of a special cathode transfer and insertion system to ensure reliable operation. The main objectives were to prevent particle contamination, achieve a transverse alignment accuracy of less than 100 µm over a transfer distance of 1.3 m under ultra-high vacuum conditions (<10⁻⁹ Torr), and ensure the safe and repeatable insertion of the cathode into the cold cavity of the SRF gun. The cathode suitcase is used to transport a single cathode but can be upgraded in the future to accommodate high quantum efficiency (QE) semiconductor cathodes.
To enable robust cathode exchanges, HZDR developed and built a special manipulation mechanism and an automated alignment system. The alignment concept was implemented using a translation rod equipped with contact electrodes and driven by precision stepper motors. Commissioning and final testing were successfully carried out at MSU to validate the transfer process. No change in RF performance was observed after the cathode exchange. The results confirmed that the system meets the design specifications and enables particle-free cathode exchange for the SRF gun at varying temperatures.
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